As was said growing in a rental is not wise. Second the more people that know a grow is being done the more mouths there are and that means the greater the chance that someone will say something at the wrong time around the wrong person or people and then there is real trouble. Another problem with growing in a shared dwelling is at times even the best of friends have a falling out and one can retaliate, say after moving out, by dropping a dime on you. Also if there are girlfriends involved they are known to be notorious rats if their guy is caught cheating on them or just suspected of cheating on them or if the guys dumps them. I could not begin to guess how many times over the many years I have grown I have heard of or read about a pissed off girlfriend, or a pissed off recently turned ex-wife for that matter) ratting out their guy.
 
My best advice would be to tell ‘your friend’ whoever ‘her or she’ is to scrap their grow plans for now and wait until ‘your friend’ can grow in a safe environment.